Trolley-pole.



D. W. SWANSON. TROLLEY POLE. APPLIUATION nun JUNE29,1910.

Patented May 2, 1911.

jumping the wire.

OSCAR W. SWANSQN, OF NEW HAVEN, CONNECTICUT.

TBOLLEY-POLE.

Specification of Letters Patent.

Patented May 2, 191 1.

Application filed June 29, 1910. Serial No. 569,595.

To all whom it may concern:

Be it known that I, OSCAR W. Swanson, a Swedish subject, residing at New Haven, in' the county of New Haven and State of Con necticut, have invented certain new and useful Improvements in Trolleylols, of which the following is a specification.

This invention relates to trolley poles, and is designed to construct a trolley pole which will eliminate the wheels that have been necessary heretofore, and which will constantly return the wire to the center .ofthe bearing surface of the pole after the same has passed around a curve.

Heretofore it has been necessary in the trolley poles wherein Wheels were used to construct the base of a pole with very strong springs in order to keep the wheel from This construction caused a great strain to be exerted on the wire, thereby weakening the same, and after a certain length of time causing the same to break. I

It is the object of the present invention to eliminate the necessity of creating such a strong pressure against the wire and to construct a pole having an elongated bearing surface w ich no matter where the wire rests, should the pole jump the wire, it will return normally to the center of the bearing surface.

It also contemplates the construction. of a trolley pole which will permit the same to pass the supporting or stay.wire of the main elevation of. a trolle trolley wire without in any way interfering with the same.

With the above and otherobjccts in View, this'invention. consists in the construction, combination, and arrangement of parts, wherein- Figure 1 is'an elevation of a trolley pole, embodying the present invention, illustrating parts thereo in section; Fig. Q-is a side pole illustrating the operation thereof; Fig. 3 is arcar elevation of the bearing surface of a trolley pole; Fig. 4 is a .section takenalong the line 4-'-i of Fig. 1; Fig. 5 is a central section taken through the bearing surface of a trolley pole; Fig. 6 is a transversesection taken along the line 67-6 of Fig.1.

The trolley pole forming. the subject-inattcr of the present invention is constructed of a contlnuous piece of metal. bent upon itself and curved at ts upper end rear-wardly,sa1d

curved portion being in substantially a horizontal plane and having a depression provlded centrally in the upper surface thereof.

This depression has a bearing shoe secured therein which is enlarged centrally where the wear is the most. Disposed between the arms of the trolley pole are a pair of cross braces which adjacent to the curved bearing portion of the ole are welded to the pole and are secure in such a manner that no short corners are lpresented, thus should the braces contact wit an obstruction, such as a down-hanging wire, said obstruction will not catch in the pole.

In carrying out the present invention a pair of arms 10 are mounted to a base A of the usual construction and are connected at their upper terminals by a continuation 11 thereof. The arms 10 are bent adjacent their upper terminals at 12 in such a man ner that the connection 11 will rest in a substantially horizontal plane. The curvature of-the connection 11 is from a center O'located between the base A and the connection 11, thus causing a different curve to be taken by the bearing surface than that taken by the pole. The connection 11 is provided with a central depression 12 in which is mounted a bearing shoe 13, said bearin shoe being curved upwardly slightly centre 1y to increase the thickness where there is the most wear.

A pair of cross braces Mare welded or otherwise secured to the arms 10 adjacent to 'the connection 11, and where the are crossed are connected by a collar 15. he free terminals 1.6 of the braces 14 are flattened and encircle the arms 10, being bent upon selves and are riveted, thus insurln a-substantial connection. The-joint 17 w ere the themcrossed braces are connected to the arms 10 are rounded so that should the same contact flier-cot curved,,said curved portion being. {10

.with an obstruction such as a down-hanging,

bent rearwardly so that the same rests in substantially a horizontal plane when said poleis in 0 erat'ive, osition.

continuous material bent upon'itself to form a curved contact member for engagement with a trolley wire, the curvature of. said member being such that the center 0 curveture is located between the base of the trol- 10 ley pole and the upper terminal. thereof, and

2. A trol ey pole ormed of one piece of said curved portion being bent so that the entire length thereof rests in substantially a horizontal plane when saidpole is in operative position. I

In testimon whereof I effix my signature 15 in presence 0 two witnesses.

' OSCAR W. SWANSON.

Witnesses:

J. AUG. Svnnsdn, EDMUND A. DINNEEN. 

